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\IBVShead{4247}{22 September 1995}       % Use it with dummy or empty arguments

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\title{OBSERVATIONS OF NSV\,06836}

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\begintext

The variability of NSV\,06836 (HV\,10431, GSC\,2016.0004,
CSV\,002213) was announced by  Hanley and  Shapley (1940)
based on the plates of the MF series taken with the 10-inch
Metcalf triplet in South Africa. They
indicated that the object might be an RR Lyr star with a
variation range from 12.2 to 12.8 magnitudes (12.8 to 13.3
according to NSV,  Kholopov, 1982).

From May 1 to July 1, 1995, the star was observed during 17
nights with a LYNXX-2 and a Starlight Xpress CCD camera in the V
band using the 0.4-m telescope at Observatorio de Mollet
(Spain). GSC\,2016.0787 was used as comparison star and 
GSC\,2016.0872 as check star (see  Figure 1).
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\centerline{Figure 1. C = Comparison star, Ck = Check star, V = NSV 06836.}
\centerline{North is on the top.}
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\centerline{Figure 2}
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Observations show that NSV\,06836 is an
RR Lyr star with almost symmetric light curve ($\varepsilon$ = 0.4), with 
a 0.38 magnitude
variation in the V band. It has a period close to 8\fh 8\fmm (Figure
2). We determined the following ephemeris for the maximum:

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\centerline{Max. = HJD\,2449851.448 + 0\fd 33924$\times$E}
\hspace*{79mm}$\pm$2\hspace*{15mm}$\pm$1
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Observations also suggest that the light variation might be
modulated by a possible Blazhko effect.
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% Call for macros \authors - \authorsrightcol - \endauthors
\beginauthors
\authorsrightcol
     Josep M. GOMEZ-FORRELLAD
     Enrique GARCIA-MELENDO
     Grup d'Estudis Astronomics
     Apartado 9481                                                                                   08080 Barcelona
     Spain
     e-mail: jmgomez@astro.gea.cesca.es
\endauthors

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\references

Hanley, C. M., Shapley, H., 1940, {\it Bulletin of the Harvard College
Observatory}, No.\,913

Kholopov, P. N., editor, 1982, New Catalogue of Suspected Variable Stars, Moscow

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